Jyotiraditya Scindia, whose exit has left the Congress on the verge of losing power in Madhya Pradesh, will join the BJP at 12.30 pm today.
For his crossover, which has threatened the Kamal Nath government in Madhya Pradesh, he is likely to be rewarded with a Rajya Sabha nomination and eventually, a spot in the central cabinet.
The Madhya Pradesh government has a wafer-thin majority of just four above the majority mark of 116. 22 Congress MLAs also quit along with Mr Scindia and if the resignations are accepted, the party will lose power.
The BJP and the Congress have moved their MLAs out of Madhya Pradesh for safe-keeping. The BJP has put up its MLAs at the five-star ITC Grand Bharat in Gurgaon, while the Congress has reportedly taken its members to Jaipur in Rajasthan, where the party is in power.